package com.ys.servlet;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.sql.rowset.serial.SerialException;

import com.sun.net.httpserver.HttpServer;




@WebServlet("/code.do")
public class ValidateCodeServlet extends HttpServlet{
	
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		doPost(req,resp);
	}
	
	
	
	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		resp.setContentType("image/jpeg");
		ServletOutputStream out = resp.getOutputStream();
		int width = 60;
		int height = 20;
		
		BufferedImage imgbuf = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		Graphics2D g = imgbuf.createGraphics();//创建一直画图的笔
		g.fillRect(0, 0, width, height);//设置图像的形状及高度
		g.setColor(getRandColor(200,250));//设置背景颜色
		g.setFont(new Font("Time News Roman",Font.PLAIN,18));//设置字体
		//������0-9֮���4λ����
		String code = "";
		Random r = new Random();//��������
		
		//������
		g.setColor(getRandColor(160,200));
		for(int i=0;i<100;i++){
			int x = r.nextInt(width);
			int y = r.nextInt(height);
			int x1 = r.nextInt(12);
			int y1 = r.nextInt(12);
			g.drawOval(x, y, x+x1, y+y1);
		}
		
		//���ŵ�
		g.setColor(getRandColor(120,240));
		for(int i=0;i<100;i++){
			int x = r.nextInt(width);
			int y = r.nextInt(height);
			g.drawOval(x, y, 0, 0);
		}
		
		
		for(int i=0;i<4;i++){
			String rand = String.valueOf(r.nextInt(10));
			code+=rand;
			g.setColor(new Color(20+r.nextInt(110),20+r.nextInt(110),20+r.nextInt(110)));//�����ֵ���ɫ
			g.drawString(rand, 13*i+6, 16);//���ַ�
		}
		System.out.println("生成的随机数："+code);
		HttpSession session = req.getSession();
		session.setAttribute("code", code);
		ImageIO.write(imgbuf, "JPEG", out);
		out.close();
	}
	
	/**
	 * ��ȡ�ƶ���Χ�������ɫ
	 * @param fc
	 * @param bc
	 * @return
	 */
	private Color getRandColor(int fc, int bc) {
		Random random = new Random();
		if(fc>255){
			fc=255;
		}
		if(fc<0){
			fc=0;
		}
		if(bc>255){
			bc=255;
		}
		if(bc<0){
			bc=0;
		}
		int r = fc+random.nextInt(bc-fc);
		int g = fc+random.nextInt(bc-fc);
		int b = fc+random.nextInt(bc-fc);
		return new Color(r,g,b);
	}
	
	

}
